DOCS.
295,
296
FEBRUARY
1917 283
(This
in
preparation)
Now,
E
=
Ep1p2
-
H
(H
=
T
-
U),
consequently:
H
=
Edv/dq1
-E
and,
if
you
integrate
over
t from
0
to
t:
rt
ƒ
Hdt
=
V
-
Uo
-
Et
=
W
-W0.
The
integral
fto
H
dt
is
thus
not
=
W,
that
is,
equal
to
that
function which
occurs
in motion
equations
(1)
and
(2).
In
fact, equations
(2)
would become incorrect if
fto
H dt
were
substituted
for W. For
W0
also
depends
on
the
constants
a1, a2,
....
Until
we
meet
again on Wednesday
at
the
colloquium![2]
Yours,
Planck.
296. From
Moritz Schlick
Rostock,
23
Orléans Street,
4 February 1917
Esteemed
Professor,
On
the
occasion
of
my
last
visit, you
were so
kind
as
to declare
your willingness
to look
over an
essay
on
relativity
that
I
had
promised
to
submit
to
the Natur-
wissenschaften.
Overwork and other
interruptions
prevented
me
from
completing
the
essay
until
now,
but
I have
finally
gotten
around
to
it after all and take
the
liberty
of
sending you
the
manuscript
now
with
the
cordial
request
that,
time
permitting,
you
subject
it to
your
scrutiny.[1]
I
would be
exceedingly grateful
to
you
if
you
would draw
my
attention to deficiencies in the
paper,
and
request
that
you kindly
point
to
any errors,
inaccuracies and
anything
else
(with
comments
on
the
reverse
side of
the
sheets,
perhaps).
The
topic
had been
proposed
in
that
form
by
the
editors,
as
the
caption
indicates,[2]
and thus the
essay
is
less
an ex-
planation
of
the
general theory
of
relativity
itself
than
an
in-depth
commentary
of
the
theorem
that
space
and time have
now
lost all trace of concreteness in
physics.[3]
My
main
goal was
to make the
explanation
as
easy
to
understand
as
is
possible;
whether
this
has succeeded to
the
degree
intended
seems
questionable
to
me,
of
course.
It
really
is
very
desirable
that
the
ideas of
the
general principle
of
rel. be known and
understood
everywhere very soon,
not
merely
for
physical
but
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